121010109596021 has 2 divisors, whose sum is σ = 121010109596022. Its totient is φ = 121010109596020.

The previous prime is 121010109596011. The next prime is 121010109596023. The reversal of 121010109596021 is 120695901010121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120572148886225 + 437960709796 = 10980535^2 + 661786^2 .

It is an emirp because it is prime and its reverse (120695901010121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121010109596021 - 2³⁸ = 120735231689077 is a prime.

Together with 121010109596023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121010109596023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60505054798010 + 60505054798011.

It is an arithmetic number, because the mean of its divisors is an integer number (60505054798011).

Almost surely, 2^{121010109596021} is an apocalyptic number.

It is an amenable number.

121010109596021 is a deficient number, since it is larger than the sum of its proper divisors (1).

121010109596021 is an equidigital number, since it uses as much as digits as its factorization.

121010109596021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 38.

The spelling of 121010109596021 in words is "one hundred twenty-one trillion, ten billion, one hundred nine million, five hundred ninety-six thousand, twenty-one".